Rotary-drive mechanism



Dem 14, E926. 1,610,673

J. 93. GRATTAN ROTARY DRIVE MECHANISM Filed Nov. 18 1924 2 Sheets-Sheet 1 o 16 11 Z1 o 3 0 INVENTOR,

/ W L 7x33 rafian A T TORN E Y.

J. G. GRATTAN ROTARY DRIVE MECHANISM 4 Dec. 14,1926. 1,610,673

I Filed Nov. 18 1924 2 Sheets-Sheet 2 Joseph G. Giafian ATTORNEY.

INVENTOR,

Patented Dec. 14, 1926.

PATENT OFFICE.

JOSEPH G. GRATTAN, OF LONG BEACH, CALIFORNIA.

ROTARY-DRIVE MECHANISM.

Application filed November 18, 1924. Serial No. 750,523.

My invention relates to rotary drive mechanism for drilling oil wells.

In rotary oil well rigs of the present construction, the rotary drive is mounted above the derrick floor and is driven by sprocket wheels and chains. The location of the rotary drive above the derrick floor has-led to many accidents to workmen due to breaking chains and exploding. brake flanges. Because of this liability of such chains to break and cause accidents, besides involving.

loss of time and labor, the chain drive has not proved quite satisfactory.

The general object of my invention is to provide a mechanism for a rotary oil well rig in which the rotary drive is mounted under the derrick floor, to materially lessen accidents above the floor, and in which the rotary is driven positively and directly by gears, thus providing a rotary drill rig which will be safe and reliable.

Other objects and advantages of my invention besides safety to the operator and crew of the drilling rig are facility of operation, elimination of the necessity for removing rotary when putting down casing, etc. more room on derrick floor for crew, drum clutches may be operated to hold drums if brakes give way, noiseless operation, saving of timeand labor, low cost of installation, and low cost of maintenance.

With this type of rotary drive it is pos sible to use a protection plate which will make it impossible for pieces of broken machinery to reach the derrlck floor and 1n-.

jure the crew.

Other objects and advantages will appear hereinafter and while I show herewith and will describe a preferred form of construction, I desire to be understood that I do not limit my invention to such preferred form but that various changes and adaptations may be made therein without departing from the spirit of my invention as herein after claimed.

In the drawings,

Fig. -1 is a plan view of the hoist mechanism and part of the drive mechanism employed in my rotary drill rig.

Fig. 2 is a side elevation of the same. i Fig. 3 is a front elevation thereof.

Fig. 1 is a horizontal sectional view taken on line 4-4 of Fig. 5 showing plan of rotary.

Fig. 5 is a vertical longitudinal section of the rotary taken on line 55 ofFig. 4.

Referring in detail to the drawings, 1 indicates the hoist drum and 2 the rotary of my oil well rig, the drum being located above and the rotary below the floor 3 of an oil well derrick. The drum 1 is loosely mounted on a shaft 4 journaled in bearings 5 on standards 6, upstanding from the derrick foundatipn through the derrick floor 3. Gears 7 and 8, the former being larger than the latter, are fixed on the shaft 1, adjacent the ends of the drum 1 and cat heads 9 and 10 are secured on the ends of the shaft. A drive shaft 11 is journaled in bearings 12 on standards 6. A sleeve 13 on the ends of which are secured pinions 14: and 15 is slidably fitted with a feather key on the shaft 11 so as to rotate therewith. The pinion 14 is of smaller diameter than pinion 15. I

A gear 16 is secured on drive shaft 11. On the ends of the drive shaft 11 are secured crank disks 17 and 18 to which the pitman rods 19 and 20 respectively of the engines 21 and 22 are connected. A counter shaft. 23 is journaled beneath the derrick floor in bearings 24. on the lower end of the standards 6. Pinions 25 and 26 are feather keyed on shaft 23 to rotate therewith, the pinion 25 being of smaller diameter than the pinion 26. A bevel pinion 27 is secured on counter shaft 23 in mesh with a bevel pinion 28 secured on one end of a rotary drive shaft 29 journaled in the bearings 30 and 31 below the derrick floor 3. The shaft 29 carries a bevel pinion 32 on its other end which meshes with the bevel gear 33 of the rotary 2. The rotary 2 is mounted on foundation timbers 34 beneath the derrick floor 3. A rotary bushing 35 is detachably mounted in the rotary 33 and extends upwardly through an opening 36 in the derrick floor a short distance abovethe floor so that it may be readily grasped when it is to be removed from the rotary. Clutches 37 and 38 are provided for clutching the drum 1 to the gears 7 and 8.

Pinion 14 is adapted to be shifted into mesh with the gear 7 which will be clutched to.drum 1 by clutch 37 to drive the drum 1 at low speed while the pinion 15 is adapted to be shifted into mesh with gear 8, which will be clutched to drum 1 by clutch 38 to drive the drum at high speed.

pinion 15, when in intermediate position, the

rotary may be driven at low speed through the shaft 23, bevel pinions 27 and 28, shaft 29, bevel pinion 32 and bevel gear 33.

A protection plate 39 is fixed to the floor 3 by hinges 40 so that it may be laid flat on the floor when repairing engines, hoisting mechanism, etc., and may be raised to a vertical position against head board 41 as shown in Fig. 2, when used as a shield for the protection of the operating crew.

Having described my invention, I claim: A 1. In an oil well rig, a drum shaft, a drum loosely mounted on said shaft, a pair of gears of different diameters fixed on said shaft, clutches for ,clutching said gears 'to said drum, a drive shaft parallel to said drum shaft, a pair of pinions of different diameters slidably keyed on said drive shaft for meshing directly with said gears respectively, the smaller pinion being adapted to mesh with the larger gear and the larger pinion being adapted to mesh with the smaller gear, a gear secured on said drive shaft, a counter tel-mediate said counter shaft and rotary whereby the rotary is driven from said counter shaft.

2. In a well rig, a drum shaft, a drive shaft parallel to said drum shaft, gears scoured to said drum shaft, gears splined. to said drive shaft and adapted to mesh with said drum shaft gears to transmit power to said drum shaft at different speeds, a counter shaft parallel to both the aforementioned shafts, gears splined to said counter shaft and movable into and out of mesh with gears on said drive shaft to change the relative speed of said counter shaft with relation to said drive shaft, a rotary, and means intermediate said eounter shaft and rotary whereby said rotary is driven from said counter shaft.

JOSEPH G. GRATTAN. 

